Jacob e



(No Model.)

J. R.. SCOTT.

SEWING MACHINE.

No. 246,563. Patent-ed Aug. 30,1881.

NVENTOR WITNESSES 7 ATTORNEYS.

NITED STATES PATENT OFFICE.

JACOB R. SCOTT, OF NYAOK, NEW YORK.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 246,563, dated August30, 1881.

Application filed August 9, 1880. (No model.)

To all whom it may concern:

Be it known that I, JACOB R. SCOTT, of Nyack, in the county of Rocklandand State of New York, have invented a new and useful Improvement inSewing-Machines, of which the following is a specification.

My improvements relate to machines for sewing boots and shoes.

The object of my invention is to insure uniformity in the movement ofthe presser-bar by the upward stroke of the needle-bar and secureuniform feed of the material. It is specially designed for use with theboot and shoe machines described in Patents Nos. 232,559 and 233,560, sothat they may be adapted conveniently for the sewing of hose, where novariation of thickness is required, but it is also adapted to be usedwith other sewing-machines where the feed is produced by a downwardmovement of the presser-bar and the stock sewed is variable inthickness.

In the accompanying drawings,forming part of this specification, Figure1 is a side elevation, partially in section, of a sewing-machine needleand presser bars having my improvements applied thereto. Fig. 2 is ahorizontal section of the same on line 00 w of Fig. 1; and Fig. 3 is anelevation of part of the presserbar, showing the ratchet.

Similar letters of reference indicate corresponding parts.

A is the upper, and B the lower, supportingplate of the sewingmechanism, in which plates the needle-bar O is sustained andreciprocated by pitman a with a stroke of uniform length.

D is the presser-bar, provided with foot I), and sustained in plates AB, so as to be capa ble of vertical movement. The feeding-finger c, hungon presser-foot b, is also of usual construction. a tubular guide, (I,that is sustained by a rod, 0, depending from plate A. The rod 6 passesloosely through an apertured arm of the guide (I, so that the latter mayslide freely on the rod, the downward movement of the guide beinglimited by a nut. Around rod 0 is a spiral The presser-bar D passesthrough spring,f, tending to force the guide 01 downward, and there isalso a spiral spring, g, around the presscr-bar between a nut on thesame and plate A, which forces the presser-bar down. The face ofpresser-bar D next to the needlebarO is formed with ratchet-teeth h onthat portion within and above guide d. Upon the guide at is pivoted apawl, i, one end of which engages with ratchet it, while the outer endextends above an arm, k, that projects from needle-bar 0.

It will be seen that by this construction the guide (Z is raised at theupward stroke of the needle-bar, and by engagement of pawl z'with thebar D the latter is also carried up. The outer end of pawl iis theheavier, so that when the guide (I is down and arm 70 free from the pawlthe presser-bar D is free to rise and fall, according to the thicknessof material beneath it, without altering the extent of its upwardmovement with the guide when the needle rises.

By the use of this mechanism there is no necessity of giving the needlea variable stroke, as heretofore practiced in this class ofsewingmachines.

I am aware that it is not new to lift the presser-bar by means of theneedle-bar to a uniform distance above the work regardlessofthethickness of the latter and at each upward movement of said bar;but

What I do claim as new, and desire to secure by Letters Patent, is

The combination, in a machine for sewing boots, shoes, or hose, of aneedle-bar, G, having arm 70, the presser-bar D, having ratchetteeth h,and the suspended guide d, having the pivoted pawl 2', weighted at theouter end, said guide and presser-bar being held down by springs,substantially as shown and described.

JAOOB R. SCOTT.

Witnesses:

O. SEDewIoK, GEO. D. WALKER.

